Diaphragm for telephone receivers



Feb. 16 1926.

E. H. ROLLINSON DIAPHRAGM FOR TELEPHONE RECEIVERS Filed Feb. 26, 1924 Receivers, set forth in the following Patented iFe-h. lit,

narrsn STATES PATENT OFFICE.

EARL H. EOLLINSON', OF LYON FARMS, NEW JERSEY.

DIAPHRAGM FOR TELEPHONE RECEIVERS.

Application filed February 26, 1924. Serial No. 695,191.

I To all ii /"tom it may concern trated and described an improved form of ,loud speaking-telephone receiver, wherein the diaphragm is made of either metallic or non-metallic material, having mounted 'at thecenter thereof aseparate and distinct armature of a diameter corresponding closely to that of the usual standard receiver. In said application the diaphragm and armature are'connected by a coupling andrivet to make the two parts substantially integral,

7 so that the structure is found to be very convenientin the process of assembling the severalparts of the receiver, entirely aside from the advantages flowing fromjthe actual use of such receiver in the way of clearness and loudness.

In the practice of my invention, however,

I have found it is unnecessary to positively connect the diaphragm and armature to- 7 metallic or composition ball, as a separator between the centers of the diaphragm and armature, not only improves sound transmission but also aids-materially in the matter of assembling the parts.

The object, therefore, of my present invention is to improve and simplify the construction ofthe telephone receiver, described in my above named patent application.

a In thedrawings:

Fig. 1 is a sectional view of the receiver showing the armature and diaphragm as separated by a small ball with the diaphragm materially larger in diameter than the armature.

Fig. 2 is a sectional view of the armature, diaphragm and separating ball detached from the receiver.

Fig. 3 is a bottom plan view of the same.

Fig. t is an enlarged fractional sectional view of the diaphragm, armature, and separating ball but with central cone shaped in dentations to receive the ball.

Fig. 5 is a similar view showing the ball connected to the armature by a retainer.

F129). 6 is a view similar to Fig. 1 but with the diaphragm and armature of the same diameter.

Fig. 7 is a detached sectional view of the armature, diaphragm and ball.

Fig. 8 is a bottom plan view of the same.

Fig. 9 is an enlarged sectional view of the diaphragm, armature and separating ball but with the ball retainer attached to the diaphragm.

Similar reference numerals refer to like parts throughout the specification and draw- 7 mg. i i

I have not deemed it necessary to show the supporting base to which my improved receiver is designed to be attached, having conlined the drawing to the parts which have to do with the diaphragm alone. The receiver is made of a cup 1, in which the magnetic system 2 is mounted in the usual or any preferred manner.

The margin of the cup is provided with a screw threaded flange 3 upon which is screwed an extension ring l, the. outer circumference to which is screw threaded to re ceive the internally screw-threaded cap 5. The cup flange 3 is provided with an annular V shaped projection 6, upon which the armature 7 rests.

The cap 5 is also provided with a similar annular V-shaped projection 8 which serves as a bearing for the margin of the diaphragm 9. The parts thus far described are substantially the same as set forth in my above said application. The armature 7 is provided with an annular series of apertures 10 anda central aperture 11.

The diaphragm 9 may be of metal, bakelite, mica, glass or any suitable material for the purpose. It is also provided with a central aperture 12 and located in the aperture 11 of the armature and the aperture 12 of the diaphragm is a ball 1?. This ball may be steel, celluloid or any metal or hard non-metal substance and serves not only the purpose of centering the armature and diaphragm in the process of assembling but also as a separator for these two elements.

In assembling the parts the ring t is screwed rather tightly upon the flange 3, after which the armature 7 is dropped into place and the hall 3.3 located in the central aperture 11; the. diaphragm 9'is then placed upon the top of the ball, after which the cap 5 is screw-ed down until the annular projection 8 bears upon the margin of the diaphragm 9. p

It will be noted that in this construction, the bearing between the annular projection S and the margin. of the diaphragm 9 will be uniform, with equalized pressure throughtation 21; between these facing indentations the ball 13 is located, and when the parts areassembled in the leoeiver cup-1', and thecap 5properly adjusted, the same results are obtained.

In order to prevent accidental loss of the ball-Inlay provide the armature 7 with a small metallic keeper 14: as illustrated in Fig. 5, said keeper being made of a small strip of thin metal bent into the shape shown and having an aperture 15 therein to retain the ball in place.

In Fig. 6 I have shown the improvement as attached to the diaphragm and armature of the samediameters, the cup 1 and the magnetic system 2 being the same as shown in Fig. '1. 'The ring a, howevcr, is omitted. and the cap 16 is reduced in diameter to fit the marginal flange 3 of the cup '1 5 the armature 7 is the same as above described, but the diaphragm 17 is correspondingly reduced in diameter. I V

In 9 I have shown a structure similarto that illustrated in Fig. 5 but inthis case, the keeper 18 is. applied to the dia phragm 9 instead of tothe armature 7.

From the foregoing description, it willbe seenthat the improved construction is materially simplified and the manufacturing cost very much reduced byreason-of the time saved in" assembling the diaphragm and armature within the receiver cup. Moreover, theequa'lized pressure upon theimargin of thediaphragm due to the tendency of the diaphragm to ride freely upon the surface of the ball and thus obviate distorting strains therein, permits a freer vibration of said diaphragm, giving added clearness and volume to sound transmission.

I claim:

1. In a telephone receiver, the combination of a receiver cup and magnet system, a receiver cap having an annular projection therein, an armature supported upon the margin of said cup,a diaphragm within said cap and a single ball separating the diaphragm and armature at their centers.

2. In a-telephone receiver, the combina tion of a receiver cup and magnet system, a receiver cap adjustably secured to the marginof the cup, an armature supported upon the margin of said cup, a diaphragm within said cap and a single ball separating said diaphragm and armature at'their centers, and retaining means for preventing the displacement'of said ball.

3. In a telephone receiver, the combination of a diaphragm and a disk armature therefor, a ball located at and separating the centers of said diaphragm and armature, and means for exerting a uniform pressure upon the. non-adjacent faces respectively of said armature and diaphragm.

t. Ina telephone receiver, the combination with a diaphragm and a disk armature,

of a separating ball, located at their centers, 7

said diaphragm and armature each having means at its cente' for preventing lateral displacement of said ball when pressure is applied to the nonadjaccnt faces of'said diaphragn'i and armature.

5. In a telephone receiver, the combination with 'a'centrally apertured disk armature, a centrally apertured diaphragm, of a ball of larger diameter thanthat of said apertures, said ball being located insaid apertures whereby to permit free movement of said diaphragm relative to said armature.

6. In a telephone receiver, the combination of a centrally apertured disk arn'iature, a ball resting inthe aperture ofsaid armature, and a centrally 'apertured diaphragm resting upon saidv ball where-by to provide universal relative movement between said armature and diaphragm.

EARL H. ROLLINSON. 

